Origin of Stokes shift in InAs and CdSe quantum dots: Exchange splitting of excitonic states

Anjana Bagga, P. K. Chattopadhyay, and Subhasis Ghosh
Phys. Rev. B 74, 035341 – Published 28 July 2006

Abstract

The mechanism of Stokes shift in semiconductor quantum dots is investigated by calculating the energy of the excitonic states. We have taken into account all possible contributions to the total electronic energy in the dot—i.e., the dielectric mismatch between the dot and surrounding medium, the effects of finite barrier height, and the electron-hole exchange interaction. The Stokes shift is calculated as a function of radius of dot and compared with experimental data on two different semiconductor based quantum dots. These results provide evidence for an exchange splitting of excitonic states, as the mechanism of Stokes shift in quantum dots.

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  • Received 21 April 2006

DOI:https://doi.org/10.1103/PhysRevB.74.035341

©2006 American Physical Society

Authors & Affiliations

Anjana Bagga1, P. K. Chattopadhyay2, and Subhasis Ghosh1

  • 1School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
  • 2Department of Physics, Maharshi Dayanand University, Rohtak, India

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Issue

Vol. 74, Iss. 3 — 15 July 2006

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